Malicious PDF — malware analysis report

Static analysis result for SHA-256 11502e4686534132…

MALICIOUS

PDF

77.0 KB Created: 2021-08-22 00:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f61e2b4f40db65599f666fe44f9fd4d3 SHA-1: a92f0839b0392a281c2df63335e42a23a8eb6f1e SHA-256: 11502e46865341329e1e5960a068abd6d44758f14821722b32d35f3bbe9b1a2c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://arcomproltd.com/userfiles/file/xixirowen.pdf In PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca16e85a6a---pizonagosi.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/koviko.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/tubipakekoxul.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/jbojj7pptvml1h85vehmeg5os0/32492020781.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/47686365238.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606d373f29f46---82987689865.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/likeniwaruruju.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd98871722d---piruxeroxitikadozusirur.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/51563925826.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/levapuzudebiragu.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/15141326924.pdfIn PDF document text
    • https://yifff.se/userfiles/file/15630406060.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/39953318010.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/36198128193.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/4rne4baqkpr0lgunivug251ui2/12643317788.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/44110944389.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/vibun.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/de27f7c4edb3a39b2e11b8ffedf40985/58842207148.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/7426653903.pdfIn PDF document text
    • http://potlista.com/file/files/nazimiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=generate+list+of+worksheets+in+excelPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC836 16976 bytes
SHA-256: f353f618bc7329a282023d8de48fa7a59701259081d6665cd8557311d19b07f5
font_01_sfnt_off0000f4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C2 10752 bytes
SHA-256: c9896f5079a28a24bb0910d6a203d9d676a9147ba8bc86e0610287d05748b2fc
font_02_sfnt_off00010d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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